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You mean the serpentine belt? It should have nothing to do with how the trans shifts-but shut off the air ride switch, jack the car up high on the driver side and look under the center of the car at the trans-there is a 'MLPS' (aka 'neutral safety switch, about $40) that are known to go bad-quite possibly your exact problem.

If you failed to shut off the air suspension switch (located in the trunk) you may have blown an air line when you jacked the car up. All Lincolns equipped with air suspension should have it shut off whenever jacking up the car. You can try to turn the switch off and back on to see if the air springs refill but if not, trace the air lines from the compressor to both the front and rear to check for a blown line. If you don't detect a blown line, you may have damaged the air springs.

The fuel filter for a mark VIII (at least in my 1993), is behind the wheelwall on the front passenger side of the car. You will need to take the wheel off and also take off the black covering by pulling out the plastic mounts and metal screws. as soon as those are removed, you will not miss the filter mounted to the inside left of the wheelwell

buy a set of factory manuals used. There is not just one picture.
the fuse box in the driving area is in the owners manual. The engine compartment diagram is in a book called Mark VIII Electrical Vacuum and Troubleshooting Manual.